1, seed selection by scaffolding: sandy soil with flat terrain, sufficient sunlight and good drainage and fertile fields are selected as nursery grounds. Must apply foot manure, 5000kg of high-quality farm manure, calcium superphosphate 100kg, and 30kg of urea per mu, spread evenly and dig deeply, and then plant seedlings in the whole border, generally 60 ~100 cm wide. Select the new seeds of the year which are suitable for dwarf planting, easy to control the tree shape, high germination rate and good quality. The seeds should be full and bright red and yellow. The amount of seeds used per mu is 3 ~ 4 kg.

2. Soaking seeds to accelerate germination: Soak seeds with 40% warm water for about 5 minutes, stirring constantly, then soak them in warm water at 20℃ ~ 30℃ for 24 hours, take them out for washing, drain off water, wrap them with 3 ~ 4 layers of wet gauze, and accelerate germination at 20℃ ~ 25℃. During germination, turn the seeds1~ 2 times a day, and wash them with clean water at about 25℃ for 2 ~ 3 times to control excess water. When 40% of the seeds sprout, they can be planted.

3. Seedling management: The seedlings emerge about 7 days after sowing, and the stems and leaves of the newly unearthed seedlings are delicate and should be properly shaded. When the seedlings have1~ 2 true leaves, the first thinning is carried out in combination with intertillage weeding. When there are 4 ~ 6 real leaves, the plastic film can be removed, and then the seedlings are thinned and fixed. Water the seedlings before planting, and plant the seedlings with a spacing of 20cm. By the end of August, when the plant height is about 50cm, the seedlings will be dwarfed. Spraying 15% paclobutrazol 200 ~ 400 times every 1 0 ~15 days, 2 ~ 3 times in a row, can control the overgrowth, cap the seedlings early, promote the dwarfing and increase the material accumulation. The number of branches can be increased when paclobutrazol treatment is combined with coring.

4. Harvest: After 40-50 days in the greenhouse, the Toona sinensis bud grows to about 20cm long and is harvested when it is well colored. When harvesting, cut it off with scissors, or cut off the bud head with a fast blade, and try not to break it off by hand to avoid damaging the bud and the tree. During the first 1 harvest, there are1~ 2 compound leaves at the base of Toona sinensis head, and 2 ~ 3 leaves at the second harvest. When the lateral buds are harvested, some lateral buds should not be harvested, so that they can form auxiliary cultivation techniques after germination, which is beneficial to restore the tree potential. Harvest every 7 ~ 1 0 days1time, and harvest every 4 ~ 5 times.